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Ayukawa Formation (Takizawa, 1970) Takizawa et al., 1974
Invalid synonym: Ayukawa Group
- Lithofacies (Upper): Sandstone
- Lithofacies (Middle): Shale
- Lithofacies (Lower): Sandstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Atsuizaki - Niiyamahama - Ayukawahama - Tashiro island - Aji island, Ishinomaki city, Miyagi pref.
- Fossils (Ammonoids): Berriasella sp., Kilianella sp., Lyticoceras sp., Sarasinella aff. hyatti, Thurmanniceras cf. isokusensis
- Fossils (Plants): Cladophlebis denticulata, Cupressinocladus sp., Frenelopsis cf. hohenggeri, Nilssonia schaumburgensis, Nilssonia schaumburgensis var. parvula
- Takizawa et al. (1987) Geology of the Yoriiso District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 5p.)
- Takizawa et al. (1984) Geology of the Ishinomaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 7p.)
- Takizawa et al. (1974) Geology of the Kinkasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 62p. (in Japanese with English abstract 5p.)